US4868845A - X-ray apparatus with a movable part - Google Patents
X-ray apparatus with a movable part Download PDFInfo
- Publication number
- US4868845A US4868845A US07/043,017 US4301787A US4868845A US 4868845 A US4868845 A US 4868845A US 4301787 A US4301787 A US 4301787A US 4868845 A US4868845 A US 4868845A
- Authority
- US
- United States
- Prior art keywords
- shaft
- bearing
- ray apparatus
- deformable body
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4476—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4464—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit or the detector unit being mounted to ceiling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4476—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit
- A61B6/4482—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit involving power assist circuits
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D3/00—Control of position or direction
- G05D3/12—Control of position or direction using feedback
- G05D3/14—Control of position or direction using feedback using an analogue comparing device
- G05D3/1472—Control of position or direction using feedback using an analogue comparing device with potentiometer
Definitions
- the invention relates to an X-ray apparatus with a movable part, having a measuring device which measures the forces exerted on the accessory and appropriately controls the drive therefore.
- a measuring device which measures the forces exerted on the accessory and appropriately controls the drive therefore.
- the motor drive is connected to the accessory via a cable, and the measuring device detects the forces acting on the cable. This demands that, in the event of an exchange of the cable, the measuring device--in general, a wire strain gauge--must also be exchanged since it must be adapted to the properties of the cable.
- the object of the present invention is to develop an X-ray apparatus of the initially mentioned type in such a manner that the drive can take place without a cable.
- This object is achieved, according to the invention, in that the drive takes place via a shaft, which is provided with at least one bearing, and in that the measuring device measures the forces exerted on the bearing in the direction of the shaft.
- the drive shaft transmits the forces acting on the accessory to the bearing where they can be measured in a simple and reliable manner.
- a refinement of the invention provides that the bearing is connected to a fixed part of the X-ray device via a deformable body and that the deformable body is provided with sensors which measure its deformation, a wire strain gauge preferably being provided as sensor.
- the (elastically) deformable body which preferably surrounds the shaft in the manner of a barrel, can be produced in a simple manner and forms, together with one or more wire strain gauges fitted to it, a robust and reliable component.
- a further development of the invention provides that the shaft is provided with a spur wheel, which is coupled with the drive and which cooperates with a spur wheel coupled to the accessory.
- This further development utilizes the fact that forces act on the helical spur gears, in the direction of the shaft on which the gears are fitted, proportional to the force exerted by the motor drive or the accessory on the shaft. By measurement of this force, it is possible to determine the turning moment, and, if a limiting value is exceeded, the motor drive can be deactuated.
- FIG. 1 shows an X-ray device according to the invention, which device is secured as a C arc device at a ceiling support,
- FIG. 2 shows a part of such an X-ray device
- FIG. 3 shows an X-ray device which is movable about a horizontal axis
- FIG. 4 shows a part of a tilt drive suitable in the case of a device according to FIG. 3.
- FIG. 1 designates a ceiling support, which comprises a plurality of hollow cylindrical parts which are displaceable within one another telescopically.
- Ceiling support 1 is secured at a support carriage 2 which is movable in rails 3 at the ceiling 4 of an examination room.
- the ceiling support 1 carries at a tube arc 5 an X-ray source 6 and an image intensifier 7, which are aligned relative to one another.
- the outward and inward movement of the ceiling support takes place by means of a motor 8, which acts on a pinion 9 which is secured at a vertical hollow shaft 10.
- the hollow shaft 10 is provided with an internal thread, into which a threaded spindle 11 engages.
- Spindle 11 is fixedly connected to the lowermost part of the ceiling support. Depending upon the direction of rotation of the motor 8, the ceiling support is moved either upwards or downwards thereby.
- the hollow shaft 10 is mounted in a bearing 13, which is connected to the carriage 2 via a barrel-shaped elastic bearing support 12.
- the elastic bearing support 12 is provided with one or more wire strain gauges, which measure the deformation of the bearing and place the drive motor 8 at standstill if the deformation or the forces excerted by the load 5 . . . 7 on the bearing exceed a predeterminable value.
- FIG. 2 shows how the hollow shaft 10 or the threaded spindle 11 is secured at the carriage 2.
- the shaft 10 or 11 is borne by a bearing 13, which is connected, via the elastic bearing support 12, surrounding the shaft 10 (11) in the manner of a barrel, to the carriage 2, which is not shown in greater detail in FIG. 2.
- To the elastic bearing support 12 there is fitted at least one wire strain gauge, by means of which the deformation of the bearing support 12 is converted into an electrical signal and which is provided via a connecting line 15 with a control circuit for the drive motor.
- a protective sleeve 16 consisting of a elastomer is drawn over the strain gauge or strain gauges.
- FIG. 3 shows an X-ray examination device with a patient support table 20, which can be tilted about a horizontal axis 21 by means of a drive motor 22, which acts on a tooth segment 23 connected to the table plate 20.
- An X-ray targeting device 24 is movable, by means of the threaded spindle 11 which engages in a spindle nut 25 secured at the targeting device 24, in the longitudinal direction of the table by means of an electric motor which is not shown in greater detail.
- the threaded spindle is secured, at least at one side, at a bearing, which is connected via an elastic bearing support, as shown in FIG. 2, to the frame of the patient support table 20.
- the displacement of the targeting device in the compression direction, i.e. perpendicular to the table plate, can take place--as is evident from FIG. 3--by means of an analogously designed drive.
- the forces measured by the bearing support are critically dependent upon the position of the table plate 20. They are minimal in the horizontal table plate position shown in the drawing and maximal in the vertical position of the table plate; between these positions, they vary with the sine of the pivot angle.
- the signal supplied by the wire strain gauge connected to the bearing support must be compared with a signal which varies sinusoidally with the pivot angle and which is obtained, for example, from a sine potentiometer, which is coupled to the drive 22.
- FIG. 4 shows a part of a drive suitable for this.
- the motor force is transmitted by means of a belt pulley 30 to a shaft 31, on which a helical spur gear 32 is situated, the flanks of which extend at an angle ⁇ to the direction of the shaft.
- the helical spur gear 32 cooperates with a further helical spur gear 33, which is coupled to the tooth segment 23 (FIG. 3) in a manner not shown in greater detail.
- the helical spur gear 32 is borne on both sides in bearings 13, which are connected via the elastic bearing supports 12 in each instance to a part 34 which is fixed in the axial direction of the shaft 31.
- FIG. 5 shows a control circuit for influencing the drive motor.
- the forces acting on the accessory cause a deformation of the elastic bearing support and thereby a variation of the resistance of the wire strain gauge.
- This variation of resistance is converted, in a resistance measuring bridge 45, into an electrical voltage, which is amplified by an amplifier 40 and is fed to one of the inputs of a comparator 41.
- the voltage at the other input can be constant.
- an additional device e.g. a 100 mm film camera 42 should be connected at the device 5 to 7, the weight which is varied thereby must be taken into account by a variation of the comparative voltage.
- a change-over switch 43 is changed over, which in a first switch position connects the comparative input of the comparator 41 to the direct voltage at a potentiometer 44 and in the other switch position connects the same to the direct voltage at a tap of this potentiometer.
- the loading which is variable in the case of a device according to FIG. 3 as a function of the pivot position of the device can be taken into account by means of a further potentiometer 47, the tap of which is coupled to the tilt drive.
- the weight of the patient which is of significance in the tilting of the patient support plate, can be taken into account, for example, in that the voltage at the comparative input of the comparator 41 is tapped off from the tap of a potentiometer 48, which is adjustable--e.g. by a keyboard 49--in dependence upon the weight of the patient.
- the three potentiometers 44, 47 and 48 can, if appropriate, also be connected in cascade.
Abstract
Description
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3614295 | 1986-04-26 | ||
DE19863614295 DE3614295A1 (en) | 1986-04-26 | 1986-04-26 | X-RAY DEVICE WITH DRIVE OF A DEVICE PART |
Publications (1)
Publication Number | Publication Date |
---|---|
US4868845A true US4868845A (en) | 1989-09-19 |
Family
ID=6299675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/043,017 Expired - Fee Related US4868845A (en) | 1986-04-26 | 1987-04-27 | X-ray apparatus with a movable part |
Country Status (4)
Country | Link |
---|---|
US (1) | US4868845A (en) |
EP (1) | EP0244011A3 (en) |
JP (1) | JPS62254738A (en) |
DE (1) | DE3614295A1 (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4955046A (en) * | 1989-04-17 | 1990-09-04 | Siczek Aldona A | C-arm for X-ray diagnostic examination |
US5052036A (en) * | 1990-04-02 | 1991-09-24 | Grady John K | X-ray stand with laterally inclined rotation axis |
US5086447A (en) * | 1990-06-04 | 1992-02-04 | Siczek Aldona A | Overhead X-ray apparatus for imaging in bi-plane configuration |
US5148454A (en) * | 1991-08-27 | 1992-09-15 | Coffman George W | Apparatus for conducting cranial X-ray tomography and radiography |
US5159622A (en) * | 1989-11-17 | 1992-10-27 | Kabushiki Kaisha Toshiba | X-ray fluoroscopic imaging apparatus with extended imaging set up range |
US5405117A (en) * | 1993-10-27 | 1995-04-11 | Davis; Greig S. | Gliding ceiling monitor support assembly |
US5475730A (en) * | 1994-08-24 | 1995-12-12 | John K. Grady | Telescoping X-ray support arms |
US5960054A (en) * | 1997-11-26 | 1999-09-28 | Picker International, Inc. | Angiographic system incorporating a computerized tomographic (CT) scanner |
US6131690A (en) * | 1998-05-29 | 2000-10-17 | Galando; John | Motorized support for imaging means |
US6374937B1 (en) * | 1998-05-29 | 2002-04-23 | John Galando | Motorized support for imaging means and methods of manufacture and use thereof |
US20050220273A1 (en) * | 2004-04-02 | 2005-10-06 | Friedrich Ueffinger | Digital radiography system |
US20070121790A1 (en) * | 2005-11-25 | 2007-05-31 | Grady John K | Angio capable portable x-ray fluoroscopy unit with sliding c-arm and variable pivot point |
US20070140436A1 (en) * | 2005-12-15 | 2007-06-21 | Eastman Kodak Company | Dual telescoping support member digital radiography imaging system |
WO2007077395A1 (en) * | 2006-01-06 | 2007-07-12 | Designers Developers Distributors Associates (D3A) Medical Systems | Medical imaging system |
US7377475B1 (en) * | 2005-07-22 | 2008-05-27 | Rodovaldo Lopez | Television mount assembly |
US20080259541A1 (en) * | 2007-04-20 | 2008-10-23 | Robert Woodward | Monitor suspension device and method of use |
US20100213383A1 (en) * | 2009-02-26 | 2010-08-26 | Fujifilm Corporation | Radiation imaging apparatus |
US20120219121A1 (en) * | 2011-02-28 | 2012-08-30 | John Matthew Simmons | Sliding counterbalanced c-arm positioning devices and methods for using such devices |
US20140263866A1 (en) * | 2013-03-14 | 2014-09-18 | Dental Equipment, Llc | Modular, bypass track and carriage system for overhead- mounted lights and other devices |
US9307946B2 (en) | 2013-03-14 | 2016-04-12 | Dental Imaging Technologies Corporation | Ceiling mounted medical imaging system |
US9897095B2 (en) | 2015-05-01 | 2018-02-20 | Hunter Fan Company | Ceiling fan kit and method of mounting |
US20180313646A1 (en) * | 2017-04-27 | 2018-11-01 | Advanced Digital Broadcast S.A. | Method and a device for adjusting a position of a display screen |
US20190239835A1 (en) * | 2016-08-29 | 2019-08-08 | Shimadzu Corporation | Holding Mechanism for X-ray Imaging Apparatus and X-ray Imaging Apparatus |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8905588U1 (en) * | 1989-05-03 | 1990-09-13 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
FR2665098B1 (en) * | 1990-07-30 | 1993-11-26 | Michel Poulain | SUSPENDED WORK PLAN. |
DE10043473A1 (en) * | 2000-09-04 | 2001-11-08 | Siemens Ag | Device for detecting the position of a component fitted to rotate on a carrier device relative to an axis of rotation incorporates a weight and a potentiometer |
DE10139343B4 (en) * | 2001-08-10 | 2006-01-19 | Ziehm Imaging Gmbh | Method and device for determining the position of the focal point of an X-ray source |
JP4571510B2 (en) * | 2005-01-07 | 2010-10-27 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | Imaging table for medical diagnostic device and medical diagnostic device |
US7469032B2 (en) * | 2005-04-11 | 2008-12-23 | Gendex Corporation | Structural and patient positioning features of an x-ray system |
DE102005020811A1 (en) * | 2005-05-04 | 2006-11-09 | Schaeffler Kg | linear bearings |
DE102018109582A1 (en) * | 2018-04-20 | 2019-10-24 | Carl Zeiss Meditec Ag | X-ray apparatus for medical applications |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3556455A (en) * | 1968-06-24 | 1971-01-19 | Fred Storm Ind Designs Inc | Overhead equipment control apparatus for operating rooms |
DE2104509A1 (en) * | 1971-02-01 | 1972-08-24 | Koch & Sterzel Kg | X-ray examination device with a motor-adjustable device part |
DE2361985A1 (en) * | 1973-12-13 | 1975-06-19 | Philips Patentverwaltung | MOTOR DRIVE FOR MOVING A UNIT PART OF AN X-RAY EXAMINATION DEVICE |
US4677273A (en) * | 1986-02-12 | 1987-06-30 | Leybold-Heraeus Gmbh | Electron beam welding apparatus |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2238420A1 (en) * | 1972-08-04 | 1974-02-14 | Koch & Sterzel Kg | ARRANGEMENT FOR THE CONTROL OF A MOTOR DRIVE |
DE2238706A1 (en) * | 1972-08-05 | 1974-02-07 | Koch & Sterzel Kg | ROUND TUBE TRIPOD WITH A C-BOW |
US4210815A (en) * | 1978-11-20 | 1980-07-01 | General Electric Company | X-ray apparatus servo system |
DE2911479C2 (en) * | 1979-03-22 | 1983-09-29 | Lechler, Gerhard, Dr.-Ing., 1000 Berlin | Force measuring device |
DE3339775A1 (en) * | 1983-11-03 | 1985-05-15 | Siemens AG, 1000 Berlin und 8000 München | X-RAY DIAGNOSTIC DEVICE WITH RADIATION FILTERS |
-
1986
- 1986-04-26 DE DE19863614295 patent/DE3614295A1/en not_active Withdrawn
-
1987
- 1987-04-16 EP EP87200718A patent/EP0244011A3/en not_active Ceased
- 1987-04-23 JP JP62098748A patent/JPS62254738A/en active Pending
- 1987-04-27 US US07/043,017 patent/US4868845A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3556455A (en) * | 1968-06-24 | 1971-01-19 | Fred Storm Ind Designs Inc | Overhead equipment control apparatus for operating rooms |
DE2104509A1 (en) * | 1971-02-01 | 1972-08-24 | Koch & Sterzel Kg | X-ray examination device with a motor-adjustable device part |
DE2361985A1 (en) * | 1973-12-13 | 1975-06-19 | Philips Patentverwaltung | MOTOR DRIVE FOR MOVING A UNIT PART OF AN X-RAY EXAMINATION DEVICE |
US4677273A (en) * | 1986-02-12 | 1987-06-30 | Leybold-Heraeus Gmbh | Electron beam welding apparatus |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4955046A (en) * | 1989-04-17 | 1990-09-04 | Siczek Aldona A | C-arm for X-ray diagnostic examination |
US5159622A (en) * | 1989-11-17 | 1992-10-27 | Kabushiki Kaisha Toshiba | X-ray fluoroscopic imaging apparatus with extended imaging set up range |
US5052036A (en) * | 1990-04-02 | 1991-09-24 | Grady John K | X-ray stand with laterally inclined rotation axis |
US5086447A (en) * | 1990-06-04 | 1992-02-04 | Siczek Aldona A | Overhead X-ray apparatus for imaging in bi-plane configuration |
US5148454A (en) * | 1991-08-27 | 1992-09-15 | Coffman George W | Apparatus for conducting cranial X-ray tomography and radiography |
US5405117A (en) * | 1993-10-27 | 1995-04-11 | Davis; Greig S. | Gliding ceiling monitor support assembly |
US5475730A (en) * | 1994-08-24 | 1995-12-12 | John K. Grady | Telescoping X-ray support arms |
US5960054A (en) * | 1997-11-26 | 1999-09-28 | Picker International, Inc. | Angiographic system incorporating a computerized tomographic (CT) scanner |
US6131690A (en) * | 1998-05-29 | 2000-10-17 | Galando; John | Motorized support for imaging means |
US6374937B1 (en) * | 1998-05-29 | 2002-04-23 | John Galando | Motorized support for imaging means and methods of manufacture and use thereof |
US20050220273A1 (en) * | 2004-04-02 | 2005-10-06 | Friedrich Ueffinger | Digital radiography system |
US7377475B1 (en) * | 2005-07-22 | 2008-05-27 | Rodovaldo Lopez | Television mount assembly |
US7300205B2 (en) | 2005-11-25 | 2007-11-27 | Grady John K | Angio capable portable x-ray fluoroscopy unit with sliding C-arm and variable pivot |
US20070121790A1 (en) * | 2005-11-25 | 2007-05-31 | Grady John K | Angio capable portable x-ray fluoroscopy unit with sliding c-arm and variable pivot point |
US20070140436A1 (en) * | 2005-12-15 | 2007-06-21 | Eastman Kodak Company | Dual telescoping support member digital radiography imaging system |
WO2007077395A1 (en) * | 2006-01-06 | 2007-07-12 | Designers Developers Distributors Associates (D3A) Medical Systems | Medical imaging system |
FR2895899A1 (en) * | 2006-01-06 | 2007-07-13 | Designers Developers Distribut | MEDICAL IMAGING SYSTEM. |
US20080319300A1 (en) * | 2006-01-06 | 2008-12-25 | Designers Developers Distributors Associates (D3A) Medical Systems | Medical Imaging System |
US20080259541A1 (en) * | 2007-04-20 | 2008-10-23 | Robert Woodward | Monitor suspension device and method of use |
US7793907B2 (en) * | 2007-04-20 | 2010-09-14 | Robert Woodward | Monitor suspension device and method of use |
US20100213383A1 (en) * | 2009-02-26 | 2010-08-26 | Fujifilm Corporation | Radiation imaging apparatus |
US8529128B2 (en) * | 2009-02-26 | 2013-09-10 | Fujifilm Corporation | Radiation imaging apparatus with assisted movement |
US8430564B2 (en) * | 2011-02-28 | 2013-04-30 | General Electric Company | Sliding counterbalanced C-arm positioning devices and methods for using such devices |
US20120219121A1 (en) * | 2011-02-28 | 2012-08-30 | John Matthew Simmons | Sliding counterbalanced c-arm positioning devices and methods for using such devices |
US8641277B2 (en) | 2011-02-28 | 2014-02-04 | General Electric Company | Sliding counterbalanced C-arm positioning devices and methods for using such devices |
US20140263866A1 (en) * | 2013-03-14 | 2014-09-18 | Dental Equipment, Llc | Modular, bypass track and carriage system for overhead- mounted lights and other devices |
US8967573B2 (en) * | 2013-03-14 | 2015-03-03 | Dental Equipment, Llc | Modular, bypass track and carriage system for overhead-mounted lights and other devices |
US9134017B2 (en) | 2013-03-14 | 2015-09-15 | Kavo Dental Technologies, Llc | Modular, bypass track and carriage system for overhead-mounted lights and other devices |
US9307946B2 (en) | 2013-03-14 | 2016-04-12 | Dental Imaging Technologies Corporation | Ceiling mounted medical imaging system |
US10244998B2 (en) | 2013-03-14 | 2019-04-02 | Dental Imaging Technologies Corporation | Ceiling mounted medical imaging system |
US9897095B2 (en) | 2015-05-01 | 2018-02-20 | Hunter Fan Company | Ceiling fan kit and method of mounting |
US20190239835A1 (en) * | 2016-08-29 | 2019-08-08 | Shimadzu Corporation | Holding Mechanism for X-ray Imaging Apparatus and X-ray Imaging Apparatus |
US10849582B2 (en) * | 2016-08-29 | 2020-12-01 | Shimadzu Corporation | Holding mechanism for X-ray imaging apparatus and X-ray imaging apparatus |
US20180313646A1 (en) * | 2017-04-27 | 2018-11-01 | Advanced Digital Broadcast S.A. | Method and a device for adjusting a position of a display screen |
US10830580B2 (en) * | 2017-04-27 | 2020-11-10 | Advanced Digital Broadcast S.A. | Method and a device for adjusting a position of a display screen |
Also Published As
Publication number | Publication date |
---|---|
DE3614295A1 (en) | 1987-10-29 |
EP0244011A2 (en) | 1987-11-04 |
JPS62254738A (en) | 1987-11-06 |
EP0244011A3 (en) | 1988-02-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: U.S. PHILIPS CORPORATION, 100 EAST 42ND STREET, NE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOROPP, NORBERT;REEL/FRAME:004744/0122 Effective date: 19870707 Owner name: U.S. PHILIPS CORPORATION, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOROPP, NORBERT;REEL/FRAME:004744/0122 Effective date: 19870707 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19930919 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |